package com.atguigu.gulimall.seckill.schedule;

import com.atguigu.gulimall.seckill.service.SeckillService;
import lombok.extern.slf4j.Slf4j;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;
/**
 * 秒杀商品定时上架
 */
@Slf4j
@Service
public class SeckillSkuScheduled {
    @Autowired SeckillService seckillService;
    @Autowired RedissonClient redissonClient;
    private final String upload_lock = "seckill:upload:lock";

    /**
     * 定时上架最近三天需要秒杀的商品
     */
    @Scheduled(cron = "*/3 * * * * ?")    //为了测试，设置每隔三秒上架一次
    public void uploadSeckillSkuLatest3Days() {
        log.info("上架秒杀的信息......");
        //TODO 幂等性处理，使用分布式锁。锁的业务执行完成，状态已经更新完成。释放锁以后。其他人获取到就会拿到最新的状态
        RLock lock = redissonClient.getLock(upload_lock);    //获取指定名称的分布式锁
        lock.lock(10, TimeUnit.SECONDS);    //设置锁的释放时间：10s
        try {
            seckillService.uploadSeckillSkuLatest3Days();
        } finally {
            lock.unlock();    //无论方法执行成功与否，都要解锁 (finally)
        }
    }
}
